As most hunters know we used to be able to use Eagle Eye to see through the doors and look at the opposite team, but they are now invisible until the match starts. However, if a warlock uses Soul Portal for healthstones (which they commonly do in 3v3 and 5v5), you can still see the small altar. That way you can get a warning that you're about to face a warlock.
The fact that noone wants to group with a hunter in arenas, so this tip can never be used, is a whole other point ;P
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